Skip jobs on variable regex that use another variable as part of regex

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At my work we have a project consisting out of many products that shares common parts. CI pipeline runs 100+ jobs and this takes a really long time specifically on dev branch that have changes for only one product.

Lets imagine example:

stages:
  - build

.template: &build_product
  stage: build
  script:
    - JOB_NAME=( $CI_JOB_NAME )
    - export PRODUCT=${JOB_NAME[1]}
    - case $CI_COMMIT_TAG in "") RELEASE=0;; *) RELEASE=1;; esac
    - echo $RELEASE
  except:
    variables:
      # CI config incorrect
      - $CI_COMMIT_TITLE =~ /.[PROD${CI_JOB_NAME[1]}\]/i
      # Dependent on script part, but correct config
      - $CI_COMMIT_TITLE =~ /.[PROD${JOB_NAME[1]}\]/i

build 12345: *build_product
build 12346: *build_product

Anchors are used to create common CI stage template for all products inside project.

I am trying to achieve functionality to push a commit with "[PROD12345]" inside commit title (firs line) to skip all jobs not related to specified product. (build 12346 and others need to be skipped then)

I have 3 problems\questions:

1. How to pass a CI variable into regex $CI_COMMIT_TITLE =~ /.[PROD${CI_JOB_NAME[1]}\]/i I suggest ${CI_JOB_NAME[1]} to evaluate to 12345 and CI checks $CI_COMMIT_TITLE =~ /.[PROD12345\]/i in commit title. How to do it right?

2. If code mentioned in question 1 is not possible to make work I tried to explicitly for each product's job:

build 12345: *build_product
  except:
    variables:
      - $CI_COMMIT_TITLE =~ /.[PROD12345\]/i

# the same for other jobs

3. Why CI allows to use variable created in script if except is evaluated before any docker images?